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3.5.2.7 Cov
Contents
Description
This function returns the covariance between two datasets. Let X and Y be two datasets and \(\bar{x}\) and \(\bar{y}\) their respective means, then the covariance between the two is defined as:
\(cov(x,y,\bar{x},\bar{y})=\frac{1}{n-1}\)\(\sum_{i=1}^\mathit{n}\)\((x_i-\bar{x})(y_i-\bar{y})\)
Syntax
double cov(dataset vx, dataset vy[, double avex, double avey])
Parameter
vx
- A dataset, or a range pointing to a single dataset.
vy
- A dataset, or a range pointing to a single dataset.
avex
- Mean of dataset vx.
avey
- Mean of dataset vy.
| Note: In Origin 92, avex and avey can be omited when setting parameters. Their default values are the average of vx and vy datasets, respectively.
Minimum Origin Version Required: Origin 92 SR0 |
Return
Returns the covariance between two datasets vx and vy.
Example
newbook; range aa = 1!1; range bb = 1!2; aa = uniform(32); bb = uniform(32); covariance = cov(aa,bb); covariance = ;